Which of the following characteristic features always holds true for the corresponding group of ...

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Which of the following characteristic features always holds true for the corresponding group of animals?
(a) Cartilaginous endoskeleton - Chondrichthyes
(b) Viviparous - Mammalia
(c) Poşsess a mouth with an upper and a lower jaw - Chordata
(d) 3 - chambered heart with one incompletely divided ventricle - Reptilia
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